The Brocade SilkWorm 3200, 3250, and 3850 switches require that the slide rails be mounted into a Sun StorEdge 72-Inch Expansion Cabinet or a Sun Rack 900/1000 equipment rack before installation of the switches. You must order the SG-XSWBRO3200-RK or SG-XSWBRO3X50-RK rackmounting kit separately for these switches.